<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const obj = {
            uname: '张三',
            age: 18,
            hobby: ['乒乓球', '足球'], 
            family: {
                baby: '小pink'
            }
        }
        // 把对象转换为 JSON 字符串
        const o = JSON.parse(JSON.stringify(obj))
        console.log(o);
        o.family.baby = '123'
        console.log(obj);
    </script>
</body>
</html>